Once trees hit their maturity, their growth slows and therefore the
rate they sequester CO2 slows. At this point, we need to be cutting
more down, not less, and burying them in the ground, either as logs or
paper or whatever. Just growing forests is not enough, because old
trees fall over and rot and give up their carbon as CO2. We have to
bury them. Right?

Here a carbon sequestration strategy is proposed in which certain dead
or live trees are harvested via collection or selective cutting, then
buried in trenches or stowed away in above-ground shelters. The largely
anaerobic condition under a sufficiently thick layer of soil will
prevent the decomposition of the buried wood. Because a large flux of
CO2 is constantly being assimilated into the worldas forests via
photosynthesis, cutting off its return pathway to the atmosphere forms
an effective carbon sink....

Based on data from North American logging industry, the cost for wood
burial is estimated to be $14/tCO2 ($50/tC), lower than the typical
cost for power plant CO2 capture with geological storage. The cost for
carbon sequestration with wood burial is low because CO2 is removed
from the atmosphere by the natural process of photosynthesis at little
cost. The technique is low tech, distributed, easy to monitor, safe,
and reversible, thus an attractive option for large-scale
implementation in a world-wide carbon market